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首页> 外文期刊>International Journal of Electrochemical Science >Novel fabrication of Li4Ti5O12 coated LiMn2O4 nanorods as cathode materials with long-term cyclic stability at high ambient temperature
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Novel fabrication of Li4Ti5O12 coated LiMn2O4 nanorods as cathode materials with long-term cyclic stability at high ambient temperature

机译：Li 4 Ti 5 O 12 包覆的LiMn 2 O 4 纳米棒的新颖制备作为阴极材料，在高温下具有长期循环稳定性

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摘要

Spinel LiMn 2 O 4 has attracted increasing interest as promising cathode material owing to its low cost,high safety, and environmental friendliness. But the further development of LiMn 2 O 4 is restricted by fastcapacity fading upon cycling, especially at high temperatures. Herein, the one-dimensional (1D)Li 4 Ti 5 O 12 coated LiMn 2 O 4 nanorods (LMO-LTO) are successfully prepared by combining sol-gel andsolid-state calcination method and ultimately enhance the cathode utilization in high-temperature andlong-cycling conditions. The as-prepared LMO-LTO cathode delivers a high initial discharge capacityof 128.5 mAh g -1 at 0.1 C rate and exhibits a promising discharge capacity over 74.5 mAh g -1 at 10 Crate. Even under an elevated temperature of 55℃, it still maintains 74.8% of its initial capacity at 1 Crate. Furthermore, the electrochemical impedance spectra (EIS) measurement confirm that comparedwith the pure LiMn 2 O 4 nanorod, lower the charge transfer resistance (R ct ) and enhanced Li + diffusioncoefficient are also strong evidences of the improved electrochemical performance of LiMn 2 O 4 nanorodsafter Li 4 Ti 5 O 12 coating.
机译：由于其低成本，高安全性和环境友好性，尖晶石LiMn 2 O 4作为有前途的正极材料引起了越来越多的兴趣。但是LiMn 2 O 4的进一步发展受到循环时快速容量衰减的限制，特别是在高温下。本文结合溶胶-凝胶法和固态煅烧法成功制备了一维（1D）Li 4 Ti 5 O 12包覆的LiMn 2 O 4纳米棒（LMO-LTO），并最终提高了阴极在高温长时间下的利用率。循环条件。所制备的LMO-LTO阴极在0.1 C的速率下具有128.5 mAh g -1的高初始放电容量，在10 Crate的条件下具有超过74.5 mAh g -1的良好放电容量。即使在55℃的高温下，在1个箱子中仍可保持其初始容量的74.8％。此外，电化学阻抗谱（EIS）测量结果表明，与纯LiMn 2 O 4纳米棒相比，较低的电荷转移电阻（R ct）和增强的Li +扩散系数也有力证明了LiMn 2 O 4纳米棒的电化学性能得到改善。 Li 4 Ti 5 O 12涂层。

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